clifford hall



(No Model.)

- 0. 0. HALL.

CHUCK.

No. 376,650. Patented Jan. 1.7; 1888.

.NITED ST TES ATENT Price.

O. CLIFFORD HALL, OF WILKEs-BAEEE, PENNSYLVANIA, AssIeNoR TO THE SHELDONAXLE OOMPANY, OF sAME PLAcE.

"cHuoK,

SPECIFICATION forming part of Letters Patent No. 376,650, dated January17, 1888.

Application filed Si ptember 13, 1887. Serial No. 249,559. (No model.)

To all whomit may concern:

Be it known that l, O. CLIFFORD HALL, of lVilkes-Barr, county ofLuzerne, and State of Pennsylvania, have invented an Improve ment inChucks, of which the following de scription, in connection with theaccompanying drawings, is a specification, like letters on the drawingsrepresenting like parts.

This invention has for its object the production of an improved chuckfor lathes, drills, or, any machines in which it is necessary to firmlyand readily grasp either the tool or the article to be operated npon.

Myinvention consists, essentially, ofachnck having jaws and independentwedge-shaped blocks and screws to move the said blocks and adjust thejaws, as will be described. 7

Figure 1 is a front View of my improved chuck with the cover-plateremoved. Fig. 2 is a top view of the cover-plate. Fig. 3 is aperspective view of one jaw of the chuck; Fig. 4, a like view of one ofthe wedge-shaped blocks, and Fig. 5 is a sectional view of a modifiedform of chuck containing my inven tion.

The chuck is and may beof any suitable metal and shape, that dependingupon the machine to which it is to be applied.

The back F of the chuck is flanged, as at E, (see Fig. 1,) the flangebeing provided with segmental enlargements B B, which form suitablebearings for Oneedge of each of the wedgeshaped blocks WV, each blockbeing actuated independently by a screw, as .9, held loosely in theflange of the chuck by suitable col lars, c c, which preventlongitudinal movement of the said screws. The inclined faces of theblocks are grooved, as at 9, Fig. 4., to receive a T-shaped projectionor lug, Z, at the outer end of each jaw C, (see Fig. 3,) the angnlarityof the grooved face of the wedgeshaped blocks and of the outer endsot'the jaws being the same, thus permitting the said blocks to slidepast the jaws O and force them (not shown) extended into holes, as at aand b.

The plate 1 has a central hole (see Fig. 2) ofsnch size as not tointerfere with the tool or article which" may be held by the chuck when5 its jaws are open to their widest extent. As each jaw is moved by anindependent wedge shaped block, one may be moved without altering theposition of the other, or one jaw may be moved to a greater extent thanthe other. The T-shaped projections sliding .in the grooves g serve towithdraw the jaws from the center of the chuck.

In the modification shown in section, Fig. 4,

the flange Eand its enlarged portions A A furnish the bearings,respectively, for the wedge-shaped blocks and the jaws, the chuck beingrectangular in form.

-1. The-combination, with the jaws of the chuck andindependently-movable wedgeshaped blocks, of screws to move the saidblocks to adjust the said jaws, substantially as described.

2. The chuck-jaws 0, provided each with a projection at its outer endand wedge-sl1aped blocks grooved to receive the said projections,combined with actuating-screws to move the said blocks independently ofeach other, substautially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

O. CLIFFORD HALL.

